Journal
COMPOSITES PART B-ENGINEERING
Volume 214, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.108750
Keywords
Ultrafine eutectic; Eutectic high-entropy composites; Microstructural analysis; Mechanical properties; Deformation mechanism
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A4A1026125, 2018R1A2B3007167]
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The study on EHECs revealed changes in phase composition, microstructure, and mechanical properties as the x value increased, leading to variations in the eutectic matrix composition and an increase in yield strength while decreasing plasticity.
The analyses of phase composition, microstructure and the mechanical properties were conducted for as-cast TaxAl0.7CoCrFeNi2.1 (x = 0.3, 0.5, 0.6 and 0.7) eutectic high entropy composites (EHECs). With the x value increases from 0.3 to 0.6, the phases of dendrite changed from L1(2) to B2 and volume fraction of ultrafine-eutectic matrix consisting of Face-centered cubic and Laves phases increased. When x = 0.7, the Laves phase appears as the primary dendrite and the matrix region changed into the bimodal eutectic structure (L1(2) + Laves and B2 + Laves). Thermo-physical parameters could be used for understanding phase formation in EHECs. Experimental and theoretical comparison using thermo-physical parameters shows a reasonable consistency. Depending on the microstructural variation, the yield strength increased from 1304 MPa (x = 0.3) to 2154 MPa (x = 0.6) and plasticity decreased from 17% (x = 0.5) to 4% (x = 0.6). In order to understand the nano-to-micronscale deformation mechanisms depending on the microstructural variations, the systematic investigations of post-deformed samples (x = 0.5 and 0.6) were carried out by multi-scale SEM, TEM, and AFM analyses.
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